Ignore MOD field for control/debug register move

Ignore MOD field for control/debug register move

This patch ignores the MOD field in control/debug register move
instructions.

gas/testsuite/

	* gas/i386/cdr.d: New file.
	* gas/i386/cdr.s: Likewise.
	* gas/i386/x86-64-cdr.d: Likewise.

	* gas/i386/i386.exp: Run cdr and x86-64-cdr.

opcodes/

	* i386-dis.c (MOD_0F20): Removed.
	(MOD_0F21): Likewise.
	(MOD_0F22): Likewise.
	(MOD_0F23): Likewise.
	(dis386_twobyte): Replace MOD_0F20, MOD_0F21, MOD_0F22 and
	MOD_0F23 with "movZ".
	(mod_table): Remove MOD_0F20, MOD_0F21, MOD_0F22 and MOD_0F23.
	(OP_R): Check mod/rm byte and call OP_E_register.